Cleanup.

At this point, *on macOS*, the following commands result in a build
of `samples/Hello-Java.Base` which use MonoVM + the Mono GC bridge:

    # prepare and build the repo against .NET 8, as that has the needed MonoVM packages
    dotnet build -c Release -t:Prepare -p:DotNetTargetFramework=net8.0 *.sln
    dotnet build -c Release -p:DotNetTargetFramework=net8.0 *.sln

    # Publish the Hello-Java.Base sample; must be `--self-contained` + `-p:UseMonoRuntime=true`
    # to get the MonoVM
    dotnet publish -c Release --self-contained -p:UseMonoRuntime=true -p:DotNetTargetFramework=net8.0 -p:UseAppHost=true -p:ErrorOnDuplicatePublishOutputFiles=false -r osx-x64 samples/Hello-Java.Base/Hello-Java.Base.csproj

    # Something is missing in the targets that `Hello-Java.Base.jar` isn't copied; copy it.
    # TODO: fix this.
    cp samples/Hello-Java.Base/bin/Release/Hello-Java.Base.jar samples/Hello-Java.Base/bin/Release/osx-x64/publish

With that setup, you can then run the sample:

    % samples/Hello-Java.Base/bin/Release/osx-x64/publish/Hello-Java.Base
    MonoVM support enabled
    # jonp: LoadJvmLibrary(/Library/Java/JavaVirtualMachines/microsoft-17.jdk/Contents/Home/lib/libjli.dylib)=1164832048
    # jonp: JNI_CreateJavaVM=4572626688; JNI_GetCreatedJavaVMs=4572626768
    # jonp: executing JNI_CreateJavaVM=1108cbf00
    # jonp: r=0 javavm=11272e690 jnienv=7fe0a32e42a8
    WARNING in native method: JNI call made without checking exceptions when required to from CallStaticObjectMethodV
    binding? net.dot.jni.sample.MyJLO@70dea4e

Next step: how much of this works targeting win-x64?

Author: jonpryor

src/java-interop/java-interop.csproj

@@ -34,7 +34,7 @@
     <DotNetRuntimePacksVersion>8.0.13</DotNetRuntimePacksVersion>
   </PropertyGroup>
 
-  <ItemGroup Condition=" '$(RuntimeIdentifier)' != '' ">
+  <ItemGroup Condition=" '$(UseMonoRuntime)' != 'true' And '$(RuntimeIdentifier)' != '' ">
     <PackageDownload Include="Microsoft.NETCore.App.Runtime.Mono.$(RuntimeIdentifier)" Version="[$(DotNetRuntimePacksVersion)]" />
   </ItemGroup>
 

src/java-interop/java-interop.targets

@@ -1,14 +1,13 @@
 <Project>
 
   <Import Project="..\..\build-tools\scripts\NativeToolchain.targets" />
-  <Import Project="obj\java-interop.csproj.nuget.g.props" />
 
   <PropertyGroup>
     <RuntimeIdentifier Condition=" '$(RuntimeIdentifier)' == '' ">osx-x64</RuntimeIdentifier>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(RuntimeIdentifier)' != '' ">
-    <_MonoNativePath>$(NuGetPackageRoot)/microsoft.netcore.app.runtime.mono.$(RuntimeIdentifier)/$(DotNetRuntimePacksVersion)/runtimes/$(RuntimeIdentifier)/native/</_MonoNativePath>
+    <_MonoNativePath>$(NuGetPackageRoot)microsoft.netcore.app.runtime.mono.$(RuntimeIdentifier)/$(DotNetRuntimePacksVersion)/runtimes/$(RuntimeIdentifier)/native/</_MonoNativePath>
     <_MonoIncludePath>$(_MonoNativePath)include/mono-2.0</_MonoIncludePath>
     <_MonoLib>-L $(_MonoNativePath) -lcoreclr</_MonoLib>
     <_EnableMono>-DENABLE_MONO_INTEGRATION=ON</_EnableMono>